22121222191 has 2 divisors, whose sum is σ = 22121222192. Its totient is φ = 22121222190.

The previous prime is 22121222183. The next prime is 22121222231. The reversal of 22121222191 is 19122212122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22121222191 - 2³ = 22121222183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121222791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060611095 + 11060611096.

It is an arithmetic number, because the mean of its divisors is an integer number (11060611096).

Almost surely, 2^22121222191 is an apocalyptic number.

22121222191 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121222191 is an equidigital number, since it uses as much as digits as its factorization.

22121222191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The spelling of 22121222191 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred ninety-one".